Built exclusively for racing by Enzo Ferrari, only 39 Ferrari 250 GTOs were assembled between 1962 and 1964. Powered by a 300-hp V-12 engine, the GTOs won three world championships — and in the decades since, have become the most sought-after collector vehicles in the world. A Ferrari 250 GTO set for auction in August will likely break the record for most expensive vehicle ever sold.

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Ferrari 250 GTO Berlinetta

This 1962 Ferrari 250 GTO, chassis number 3851 GT, has been owned by the same family for 49 years. Bonhams will sell it without reserve next month; last year a GTO sold in a private trade for $50 million.